Rule books, and rule suplements, take me a long time to read. It's not that I don't enjoy them, sometimes it just takes me a while to process what I'm reading. The best thing about a rules book is getting ideas for the game. This book gave me loads of ideas for a Werewolf game... If only we were playing.
A pretty good sourcebook for spirits in the new World of Darkness. Not quite as detailed and complete as the "Axis Mundi" book of spirits for the old World of Darkness, but more designed to give the Storyteller their own options . . .